Is your feature request related to a problem? Please describe.

The fitness tracker is a solo experience. Users cannot work out with friends, join group sessions, or compete with others in real-time. There's no social element — no leaderboards, no shared challenges, and no workout buddy system.

Describe the solution you'd like

1. Implement multi-user workout rooms:
   • Create/join a workout room with a shareable link or room code.
   • Real-time sync of participants' exercise counts via Socket.IO rooms.
   • Show participant grid (2-6 users) with individual pose detection.
   • Shared rep counter and individual form scores.
2. Add competitive modes:
   • Race Mode: First to 50 reps wins.
   • Endurance Mode: Last person doing reps wins.
   • Form Battle: Highest average form score wins.
3. Add social features:
   • User profiles with workout stats.
   • Follow/unfollow system.
   • Activity feed showing friends' workouts.
   • Challenge system: "I challenge you to 100 pushups today."
4. Add real-time voice chat using WebRTC for workout motivation.
5. Add workout room spectator mode for coaches/trainers.

Describe alternatives you've considered

Integration with Zoom/Google Meet for video, but native integration is smoother and doesn't require third-party accounts.

Additional context

• GSSoC '26: Yes, this issue is open for GSSoC '26 contributors.
• Level: Advanced
• Affected Files: server/ (room management), src/ (multi-user UI), Socket.IO configuration

Screenshot required: A mockup of the multi-user workout room showing participant grid with rep counters and leaderboard.